Motorad 246-174 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Motorad Standard 246-174 engine coolant thermostat is built for precise temperature control in demanding cooling systems. With a 170°F opening temperature, copper case construction, and wax compound response, it supports stable coolant flow for select BMW and Rolls-Royce applications.

Compatible With 1975-1998 BMW and Rolls-Royce applications, including BMW 530i, BMW 528i, BMW 528e, BMW 533i, BMW 320i, Rolls-Royce Silver Shadow II, Rolls-Royce Silver Spirit, Rolls-Royce Silver Spur, and Rolls-Royce Touring Limousine.

• Motorad Standard line OE-style thermostat for engine cooling service
• 170°F temperature rating for controlled coolant regulation
• Copper case and wax compound for quick response to coolant temperature changes
• Offset design with air relief valve where applicable
• OEM-style seals included where applicable
• Sealing flange outside diameter: 2.64 in
• Bypass diameter: 1.46 in
• Bypass length: 1.36 in
• Flange thickness: 0.05 in
• No gasket or seal included
• No jiggle pin weep hole

Product Details and Fitment

Motorad 246-174 is manufactured to OEM specifications and processes using materials selected for OE-level fit and thermal response. The Standard product line focuses on direct replacement cooling components for vehicles that require consistent thermostat operation, including BMW 530i, BMW 528i, and Rolls-Royce Silver Spirit applications. This part cross-references Gates 24674 for the same application.

• Fits 1975-1978 BMW 530i, N/A
• Fits 1979-1981 BMW 528i, N/A
• Fits 1980-1981 BMW 320i, N/A
• Fits 1982-1983 BMW 528e, N/A
• Fits 1983 BMW 320i, N/A
• Fits 1983-1984 BMW 533i, N/A
• Fits 1977-1980 Rolls-Royce Silver Shadow II, N/A
• Fits 1981-1995 Rolls-Royce Silver Spirit, N/A
• Fits 1981-1998 Rolls-Royce Silver Spur, N/A
• Fits 1994 Rolls-Royce Touring Limousine, N/A

Common Cooling Issues This Thermostat Can Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature swings caused by inconsistent thermostat opening
• Restricted coolant flow from a worn or sticking thermostat
• Cooling system service on BMW and Rolls-Royce models with OE-style thermostat requirements
• Replacement of a thermostat that no longer responds accurately to coolant temperature

Installation Notes and Tips

Verify the 170°F temperature specification and match the sealing flange, bypass dimensions, and housing style before installation. Clean the thermostat housing mating surfaces thoroughly, and inspect the cooling system for contamination or corrosion that could affect thermostat performance. Because no gasket or seal is included, confirm the required sealing components for the application before assembly.

Quality Assurance

Motorad manufactures this thermostat with OEM-quality materials and safety standards as an OE supplier. The copper case and wax compound are selected to provide responsive temperature control in demanding automotive cooling systems, while OEM-style manufacturing practices support consistent replacement quality.